pyqt5

在UI中使用自定义的Widget类 §

• *.ui文件的修改：Windows下安装pyqt5-tools，用QT designer打开
• 在设计的GUI界面选中Widget后在Object Inspector中可以看到相应的项目也被选中，右键弹出菜单选Promote Widgest
• 添加对应的类名（如RangeSlider）
• 添加头文件名称（若引用的为Python脚本，则删掉后缀，如range_slider），这样相当于from range_slider import RangeSlider
• 使Promote生效
• 此时在*.ui中修改的界面元素的widge class应该已经改为了”RangeSlider”
• 并且在</widget>和<resources/>之间增加了

<customwidgets>
  <customwidget>
   <class>RangeSlider</class>
   <extends>QSlider</extends>
   <header>range_slider</header>
  </customwidget>
 </customwidgets>

改变窗体大小事件 §

• 参考Detect resizing in Widget-window resized signal，代码示例

  from PyQt5 import QtCore, QtGui, QtWidgets
   
  class Ui_MainWindow(object):
      def setupUi(self, MainWindow):
          MainWindow.setObjectName("MainWindow")
          MainWindow.setWindowTitle("MainWindow")
          MainWindow.resize(200, 200)
          self.centralwidget = QtWidgets.QWidget(MainWindow)
          self.centralwidget.setObjectName("centralwidget")
          MainWindow.setCentralWidget(self.centralwidget)
          QtCore.QMetaObject.connectSlotsByName(MainWindow)
   
   
  class Window(QtWidgets.QMainWindow):
      resized = QtCore.pyqtSignal()
      def  __init__(self, parent=None):
          super(Window, self).__init__(parent=parent)
          ui = Ui_MainWindow()
          ui.setupUi(self)
          self.resized.connect(self.onWindowSizeChanged)
   
      def resizeEvent(self, event):
          self.resized.emit()
          return super(Window, self).resizeEvent(event)
   
      def onWindowSizeChanged(self):
          print("the size of the window has been changed!")
   
   
  if __name__ == "__main__":
      import sys
      app = QtWidgets.QApplication(sys.argv)
      w = Window()
      w.show()
      sys.exit(app.exec_())

  • 注意resized是类属性，不能放在__init__中定义，否则会报AttributeError: 'PyQt5.QtCore.pyqtSignal' object has no attribute 'connect'的错误